Proposal for Choice Card: add switch type and conditional block

[philschanely]

Description

Problem: Right now there is some ambiguity related to when and how to use the Radio bordered versus the Choice card. Related, there is a similar overlap between Switch bordered and feature toggle. Behind the scenes the Choice Card is primarily set up to work like a tab selection, activating a separate tab pane, yet cases exist where a panel within the card itself should toggle instead.

Proposal: This proposal involves several aspects:

1. Consolidate all "bordered" options out from Radio and Switch onto Choice. Choice would have Switch as a new "icon" option (it already has radio, icon, and arrow). Form fields can still be behind the scenes as is currently set up through the radio_configs prop on Choice (although this prop may need to be renamed as input_configs and allow for type as a new option within it). The end goal here would be that any uses of SageSwitch or SageRadio that use bordered could instead use SageChoice and benefit from a single interface.
2. Add a new optional affordance on SageChoice for a slot within the card itself to toggle on and off as the choice is selected and deselected. This should allow for any content to be passed within, and is most likely to be used for providing additional form fields for settings related to the option that the user has selected through selecting that choice card.